Unfortunately, the range of a single computer is very limited, and an ad-hoc wifi network requires that all computers be in range of one another. What you would

Unfortunately, the range of a single computer is very limited, and an ad-hoc wifi network requires that all computers be in range of one another. What you would really need to do is create a mesh network, where each host relays messages to other hosts within range. This way, you can communicate with hosts that aren't within direct range of your wireless radio.